/Engine/Source/Runtime/Engine/Classes/Engine/SkeletalMeshEditorData.h
Return the imported source LOD data, create one if there is nothing. Previous reference get by this function can be invalid if we have to add items
[FRawSkeletalMeshBulkData](API\Runtime\Engine\Rendering\FRawSkeletalMeshBulkData) & GetLODImportedData ( int32 LODIndex )